What is the stability mode of the micro pump?

DC motor pump has the advantages of small electromagnetic interference, long life and low noise. From the aspect of steady speed, it also has the characteristics of high stability accuracy, which is directly related to the stable accuracy of micro pump output flow. The brush DC motor is directly driven by the DC power supply. When the steady speed is required, a special integrated block can be used, and the feedback signal is taken from the reverse potential of the rotor of the micro-pump motor. When steady speed is needed, the drive IC with steady speed function can be used, or the steady speed circuit with steady speed function IC can be used.

FG calls it a frequency generator, which is actually a device that transforms the magnetic pulse signal into a synchronous electrical signal, which plays the role of electromagnetic coding. This paper introduces the speed stabilization principle of using brushless motor micro pump PG. The principle of steady speed is in the use of micro gas pump and micro water pump, with brushless motor FG as the pump speed feedback signal can form a voltage servo circuit or locked servo circuit, can also form a mixed speed stability circuit with voltage servo and locked servo, which depends on the requirements of the whole system for flow stability accuracy. The first is the speed stabilization principle of the voltage servo circuit. The output frequency of the FG pulse signal of the micro pump is proportional to the speed of the pump motor. The signal changes into the voltage proportional to the speed. The level of the comparator is compared with the reference voltage. The comparison results are calculated and the PWM control signal is adjusted, so as to achieve the purpose of steady speed. The second is the speed stabilization principle of the phase-locked servo circuit. The FG signal frequency of the micro pump is directly proportional to the rotational speed of the pump motor. The signal is entered into the phase comparator by the waveform shaping circuit and compared with the reference frequency, and the comparison result is sent by the integration circuit into the amplifier to adjust the PWM control signal to achieve the purpose of steady speed.

For the structural type of FG mentioned above, FG is a device that changes the magnetic pulse signal into a synchronous electric pulse signal through the principle of electromagnetic induction. The magnetic pulse signal is fabricated on the rotor, whose frequency is proportional to the rotational speed. The electric pulse signal is made on the stator, and the synchronous electric signal is obtained by inductive magnetic induction. Due to the different structural types of brushless DC motor, the structural types of FG are also very different, which leads to a great difference in quality. Originally planned to buy imported micro gas pump anatomy, but up to now, we have not found any foreign brands of the speed gas pump with FG and PWM functions. In China, we only found that the speed pump of "Chengdu Gas Sea" has this function. After detailed dissection, it is found that the configuration of their speed regulating pump FG is of good structure and has high reliability. The motor output 6 pulse waves per turn of FG line, which is equivalent to a resolution up to 60 degrees turn Angle.

The characteristics and application of micro pump is to use the speed feedback principle to stabilize the speed is a classic theory, the early use of speed generator is a typical example. At present, there are often examples of using the speed sensor to obtain the pump speed signal, but this speed stabilization method is more cumbersome and the volume is large, the volume of FG speed stabilization method is significantly reduced, and the signal frequency can be done very high, which is easy to effectively ensure the accuracy of speed stability. Secondly, the reason why the steady speed mode of the brush motor micro pump is not widely used is that the poor steady speed effect, large electromagnetic interference, short life and many other defects cannot be overcome. The volume of dc brushless motor can be very small, VML series adjustable speed micro air pump adopted by brushless motor (it is said to be customized abroad, domestic also did not see manufacturers can produce such high performance miniature brushless motor), and life, speed accuracy can improve an order of magnitude, as for the electromagnetic interference performance and brush motor pump is different. Other speed regulating gas pump VLK5005, FAY6003, speed regulating water pump WNY600 after testing, the speed stability effect is also very excellent. With PWM speed regulation function of micro air pump, micro pump can let us easily realize the pump flow regulation, stable function, and through electronic control way fundamentally to manage the pump output flow, coupled with FG feedback signal, that is something, to more precision, more intelligent, must in the field of high-end.

The above is our VSD motor to share with you about the principle of the steady speed mode of the micro pump expertise. For more information, please contact our professional customer service personnel to answer. Thank you for clicking and watching.